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Well, there are advantages and disadvantages to both. If your polycarbonate is mostly 'specular' transmissive, meaning that the light is not scattered diffusely when passing through the material, dielectric is preferable. Trans will be the best option if the material is very "hazy" or has little visible transmission. The problems with trans are that (1) it does not refract light, and (2) it is not angularly dependent.